Kasia earns her living by breaking into other people's homes. One day on the job she finds a dead body of a man and decides to move into his apartment and find out who he was.

For his birthday, eight-year-old Oskar receives a clue about a mysterious treasure hunt left to him by his deceased parents. He immediately hires the best detective he knows: The star of the popular TV series "Detective Bruno". Together, the two embark on a turbulent paper chase and discover far more than just the next clue. A heart-warming family adventure to guess along with!

The title character of the film is a retired nurse who lives alone and is always in a hurry to help others. She knows perfectly well what pain and suffering are, she has experienced the loss of people closest to her, and as a nurse she has become accustomed to transience and death.